Jump-spark ignition apparatus for internal-combustion engines.



M. B. GRIST. JUMP SPARK IGNITION APPARATUS POR INTERNAL GOMBUSTION ENGINES.

APPLIGATION FILED PEB.15, 1906.

Patented Mar. 10, 1914,'

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IP'VEN}OR 27 B f VQ SUM AITORNEY UNITED STATES PATENT oFFioE.

MARK B. CRIST, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE COLONIAL TRUST COMPANY, TRUSTEE, OF PITTSBURGH,- PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

JUMP-SPARK IGNITION APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Mar. 10, 1914.

Application led February 15, 1906. Serial No. 301,227.

To all whom it may concern:

Beit known that I, MARK B. CRIST, a citizen of the United States, and a resident of Pittsburgh,'in the county of Allegheny and State of Pennsylvania, have made a new and useful .Invention in Jump-Spark Ignil scribed and illustrated.

In thev drawings accompanying this application and forming apart thereof the figure is a sectionalview of a transformer embodied in my invention.

A primary coil 3, mounted on an annealed wire core 4, is inclosed within a cylindrical liber casing 5 on which secondary coils 6 and 7 are mounted. The coils are inclosed within a shell 8, which is provided with a fiber bottom portion 9 and a fiber top portion 10 which is connected to the casing 8 by suitable screws 11.`

Secondary terminal screws 12 and 13, primary terminal screws 14 and 15 and a condenser terminal 16 are mounted on the top portion 10. The lower end of the annealed wire core 4 is mounted in a cylindrical recess 17 of a fiber bush 18, which is attached to the fiber casing 5. The casing 5 is supported by the bottom portion 9 and .is held in place by a cylindrical recess 19. The fiber top portion 10 ofthe inclosing casing is provided with a recess 21 by which the up per end of the iron core and the fiber casing 5 are held in place.

The inclosing shell 8 is adapted to be filled with transformer oil and each end of the casing 5 is provided with annular rows of holes 22 which permit' of a circulation of oil around the primary coil 3 since considerable clearance is maintained between the surface of the coil and the interior .surface of the casing 5. l

A condenser 23, (shown diagrammatically) and which vin practice may consist of any well known construction, is connected between the wires 24 and 25, in parallel with the secondary coils G and 7 which are in series in the circuit. The portion of the wire 24 adjacent to the coils 6 and 7 is provided with a glass insulating tube 26. The condenser 23, in parallel with coils 6 and 7, gives a fatter or heavier spark than the same coils would give without a condenser.

The advantage of using transformer oil in combination with the shell 8 and the liber casing 5 is that convection currents are set up withinv the casi-ng causing the oill to cir#` culate through and around the coils and the shelll 8 materially aids in carrying of the heat by radiation. The viscosity of the transformer oil is low and it therefore proves a valuable auxiliary in insulating the coils since if a break in the insulation does take place and aspark jumps across it the oil at once fills the gap and the insulationv is renewed; and since the transformer oil does not carbonize when subjected to anelectric spark no serious dificulties are encountered.

Having now described my invention, what I desire to secure by Letters Patent is:

1. In a transformer the combination of a primary coil, a casing, a secondary coll surrounding said casing to permit a-lcirculating space, an outer shell a cooling and insulating 'liquid inthe outer shell surrounding said coils, and ports located in said casing whereby a circulation of liquid may be had through the space between the primary coil and said casing by convection currents when the coils`are energized.

2. In a transformer the combination of a primarycoil, a metallic coretherefor, a casing spaced away from the primary coil but surrounding it, a secondary coil on the casing, a shell surrounding said coils, said casing having ports at its ends whereby a circulation of cooling and insulating liquid may be had within said shell and between said coils due to convection currents when the coils are energized.

3. In a transformer the combination of a primary coil, a vertically extendin tubular casing surrounding said coil an spaced from it, a secondary coil mounted on said In testimony whereof, I have hereunto Casin said casing having ports at its resubscribed my name 'this 13th day of Februspective ends, a shell inclosing both of said ary, 1906.

coils and containing a cooling and insulat- MARK B. GRIST. ing liquid adapted to circulate through the Witnesses:

ports and between the tubular casing and CHARLES MCGHEE,

the first mentioned coil. E. XV. MCCALLISTER. 

